User's Manual l MB-SMARC-3 UM 0100 l © 2022, TQ-Systems GmbH
Page 8
3.5
DIP switches S1, S2, S3, S4
Illustration 2:
Position of DIP switches
DIP switches S1, S2, S3 and S4 provide the following functionality:
•
Audio (S1)
o
ON -> I
2
S
o
OFF -> HDA
•
Display (S2)
o
ON -> eDP
o
OFF -> LVDS
•
Boot Select (S3)
o
The options of DIP Switch S3 are predefined by the module
o
•
USB and serial Port (S4)
o
S4-1 ON -> RS-232 (SER5)
o
S4-1 OFF -> RS-485 (SER5)
o
S4-2 On -> Full Duplex (SER5)
o
S4-2 OFF -> Half Duplex (SER5)
o
S4-4 ON -> USB0 OTG_ID = 0
Table 2: Boot options
S3-1
S3-2
S3-3
S3-4
Boot source
BOOT_SEL0#
BOOT_SEL1# BOOT_SEL2# FORCE_RECOV
ON
ON
ON
OFF
MB-SMARC-3 SATA
OFF
ON
ON
OFF
MB-SMARC-3 SD Card
ON
OFF
ON
OFF
MB-SMARC-3 eSPI (CS0#)
OFF
OFF
ON
OFF
MB-SMARC-3 SPI (CS0#)
ON
ON
OFF
OFF
Module device (NAND, NOR)
OFF
ON
OFF
OFF
Remote boot (GbE, serial)
ON
OFF
OFF
OFF
Module eMMC Flash
OFF
OFF
OFF
OFF
Module SPI
–
–
–
–
ARM specific Serial Downloader Mode
Most x86 modules only support the boot sources "Module SPI" and "MB-SMARC-3 SPI". For TQ's x86 SMARC modules only S3-3
(BOOT_SEL2#) is relevant. This toggles between the UEFI BIOS Flash on the module and the mainboard. Booting the operating
system from mass storage devices is determined via the BIOS settings.
Audio Mux.
Switch
Boot select
Switch
USB and serial
Port switch
LVDS/eDP
Mux. Switch
